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  1. P

    Domestic RCD trips every morning between 08.00 and 09.00

    I live in rural Italy. You get to chose your max KW here and pay accordingly. Most home have 1.5-3.0 kw, I pay extra for 5kw. I am at the end of the low voltage lines, one of only a few on this circuit. I constantly have voltage problems, according to my fluke multimeter it can go from 190v to...
  2. S

    Domestic Nuisance RCD advice

    Hi I hope this is the right forum to ask some advice for what I hope is a straight forward question. Short version: Is an RCD required in domestic installation where there are 2 consumer units, each with its own RCD? The layout of the system is Meter > RCD (BG 80A/30mA) > split > CU1 with...
  3. E

    RCD Selection Tips

    Hi Guys found this link today, someone may find it useful. Practical tips for selecting Residual Current Device (RCD) for your application | EEP -...
  4. H

    Requirements for RCD protection

    Good morning all. So question; if you’re making additions to an existing circuit, but the new cable is not min 50mm deep in wall or mechanically protected and the current circuit is not RCD protected do you tell customer that RCD protection is required as per the regs? My thought is yes and...
  5. C

    Testing 300mA RCD with Megger 1552

    Hi, am I right in thinking that a Megger 1552 can’t test RCD’s at more than 1000mA? Therefore a 5x test on s 300mA RCD can’t happen?
  6. M

    Water Pump requires Type A differential switch (RCD?)!

    I am installing a DAB Divertron 1000 water pump in a rainwater harvesting tank and was surprised to discover that the enclosed "Safety Instructions" booklet states "The differential switch protecting the system must be correctly sized and must be of the "Class A" type. It must guarantee...
  7. B

    RCD trip time greater than 300ms

    Got sent this, RCD Failed x1 greater than 300ms maybe if they changed the supply at top of RCD, currently have neutral on the left and line in the right , also the RCD is fed from 63Amp MCB is that all good just feeding an RCBO 30ma board
  8. M

    Rcd rating....may be a stupid question

    ....what mA is this rcd??
  9. V

    Landlords EICR and t&e sub mains without RCD

    Hi All Been doing a lot of EICR for landlords recently due to new legislation and agents i guess. One common issue im finding even with relatively new (10 years) old installations is a T&E sub main. Now some of these have a 100mA rcd .. or no RCD .. some are even wired in concentric cable...
  10. gazdkw82

    RCD testing - metrel MI3000

    Been noticing that when I run an auto RCD test I sometimes get a failure on the x1 and sometimes x1/2. However when performing the tests individually everything is fine. Has anyone had these issues?
  11. R

    Best MFT to avoid RCD uplift?

    just wondering if anyone can recommend an MFT that doesn't suffer (much) from RCD uplift? my megger 1710 is definitely not on the list :angry:
  12. B

    Domestic RCD cutting without physically tripping. a

    Hi I’m new. I have a flat in Madrid which was re-wired in 2011. The fuse box has a single pole 25A breaker, plus a 2P 25a breaker. These feed an RCD known here as a “diferencial”. When I use the oven plus hob plus aircon the power goes off but none of the consumer unit switches physically trip...
  13. Weezy

    Industrial RCD protect Forklift? Yes or No?

    The Job: We are going to wire a forklift point in 6mm swa surface wiring inside a warehouse. It’s a 3Phase forklift point 32amp. Wired from a 3phase eton C32 MCB. Will surface clip swa along existing cable tray down to a rotary isolator and 32amp commando outlet. Jobs pretty simple however...
  14. FatAlan

    Domestic Lighting - RCD protection

    Coming across a few installations with no RCD protection. How are folks finding it out there when doing minor alterations / additions to existing lighting circuits with no RCD protection bearing in mind 18th Edition requirements. Appreciate every installation is different. Are folks replacing...
  15. M

    Using one phase of three phase supply, will rcd work properly?

    I have a property abroad that has just been given a new supply by my local electrician . It has gone from six mm2 single phase supply to 10 mm2 three-phase supply it has a three-phase RCD unit and currently is only using one of three phases The other phases will come into use when the...
  16. kingeri

    Domestic 10mA RCD for bathroom circuits

    Been to look at a job this morning for a CU change, customer the type who wants to have his say on every tiny detail. He has already bought the CU as well, a Wylex RCBO unit..... I pointed out that the RCBO ratings he has bought don't align with what I actually need...and that some will need...
  17. M

    Square D rcd wont trip with my tester

    Hi guys wondering If anyone can shed some light either through knowledge or experience of the same problem. I have a Megger MFT 1731. Whenever I come to square D type rcds my tester doesn't trip them. I try it on doing the manual settings for 1x and 5x and even the auto. Ramp tests won't...
  18. E

    Domestic RCD not tripping - tech advice

    Hi Hopefully some can explain this perplexing issue I'll try and explain the situation as best I can, hopefully its not to rambling -maybe its common knowledge but I'll bow to anyones supperior understanding During an EICR checked test button RCD would not trip - checked with tester no...
  19. S


    Installed a new radial circuit in a garage from an existing CHINT garage unit. All functioning well (tests fine) until after the RCD test. Then everything, lights etc stops working. On investigation, while I've got 244V at the incoming side of the main switch I'm getting a reading of...
  20. A

    Large oven tripping RCD

    Hi all. Looking for a bit of advice. Customer has a new large induction rangemaster cooker with a total power of 14.8kw. Currently on a Hager board with a 50a b mcb and an existing 6mm cable. As soon as oven was switched on it tripped the RCD. Taking diversity into account the cable should be...